#include "ST_UART1.h"  
#include <stdio.h>
#include "rtthread.h"

//////////////////////////////////////////////////////////////////
#if 1
#pragma import(__use_no_semihosting)             
struct __FILE 
{ 
    int handle; 
}; 
FILE __stdout;       
void _sys_exit(int x) 
{ 
    x = x; 
} 
int fputc(int ch, FILE *f)
{   
    while((USART1->SR&0X40) == 0);
    USART1->DR = (u8)ch;      
    return ch;
}
#endif

void USART1Init(uint32_t bound)
{   
    GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;
    
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); 
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
    
    GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_USART1); 
    GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1); 

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; 
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; 
    GPIO_Init(GPIOA,&GPIO_InitStructure); 
    
    USART_DeInit(USART1);
    USART_InitStructure.USART_BaudRate = bound;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;  
    USART_Init(USART1, &USART_InitStructure); 

    USART_Cmd(USART1, ENABLE); 

    // Enable USART1 RX interrupt
    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
    NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 7;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

// USART1 interrupt handler
void USART1_IRQHandler(void)
{
    if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
    {
        USART_ClearITPendingBit(USART1, USART_IT_RXNE);
        // Just read and discard received data
        USART_ReceiveData(USART1);
    }
}
